Combination window lock and installation gauge



FIG. 1 is a top view of a combination window lock and installation gauge showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof; and

FIG. 5 is a bottom view thereof. 

The ornamental design for a combination window lock and installation gauge, substantially as shown. 